doolittle



2 Sheets Sheet 1.

(No Model.)

w. W. DOOLITTLE.

SCREW CUTTING MACHINE.

N0. 489,222. Patented Jan. 3, 1893.

I fire/7%)" WZZZZd/i/ WaZ/ifia (No Model.)

2 Sheets Sheet 2. W. W. DOOLITTLE.

SCREW CUTTING MACHINE No. 489,222. Patented Jan. 3, 1893.

$ M rm m V v E:

UNITED STATES PATENT @FFICE.

WILLIAM W. DOOLITTLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE CRANE COMPANY, OF SAME PLACE.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 489,222, dated January 3, 1893.

Application filed February 15, 1892. Serial No. 421,607- (No model.)

To all whom it may concern: secured to the ring C, by screws d, as seen in Be it known that I, WILLIAM W. DOOLIT- Figs..1 and 2. The inner ring C, has an ex- TLE, a citizen of the United States, residing at ternally projecting flange c at its rear edge, Chicago, in the county of Cook and State of against which the ring B, abuts. This ring 5 Illinois, have invented certain new and useis also provided with openings or sockets c fullmprovementsin Screw-Cuttinglllachines, cut in through the body thereof, as seen in which are fully set forth in the following speci- Figs. 1 and 2. These openings are for the refication, reference being had to the accompaception of the cutter or die holders E, which nying drawings, in whichare shaped to set into the former, as seen in [0 Figure 1, represents afront elevation of the Fig. 1. These holders are substantially rectdie-head or holder of a threading machine 'angular blocks, in the inner ends or faces of embodying myinvention,partly broken away. which are cut grooves or channels 6, extend- Fig. 2,asection of the same taken on line 22 ing entirely across the holders, and adapted of Fig.1. Fig. 3,a side elevation of one of the to receive the dies or cutters F. The latter r 5 dies and its holder detached, and Fig. 4,asecare long rectangular strips adapted to set tion of the same taken on line 4-45 of Fig. 3. into the rectangular grooves in the holders My invention relates to machines for cutand provided at their outer edges with the ting threads on bolts,tubes, rods, &c.; and the required cutting teeth f. In one side of each invention consists in a certain construction cutter there is also provided a shallow con- 20 of the dies and their holders, and the means cave groove f which is threaded, as seen in of fastening and adjusting the former in the Fig. 3; this threaded groove is arranged so latter. as to lie within the seat groove for the cutter As my present invention relates onlyto the in the holder E, and in the latter, directly opabove named particular part of the machine, posite this groove in the cutter, there is pro- :5 it is not necessary to show and describe a vided a similar threaded groove 6'. These complete machine, for, in other respects, it is two threaded grooves or channels, when the of ordinary and well known construction. I cutter is properly seated within the holder, have therefore shown in the drawings and form a circular threaded aperture for the rewill describe only such part of the machine ception of a screw G, which being turned into 30 as is necessary to an understanding of the place, as seen in Fig. 4, of the drawings, will construction and operation of my improveefiectually fasten the cutter in proper posiments, and these latter will be definitely tion in its holder. These fastening screws pointed out in the claims. are set in from the front and are covered by In the drawings, A represents the cutter or the fastening ring D,as seen in Fig. 1. If de- 3 5 die head of a screw threading machine, and is sired the opening may be slightly tapering the only part of the machine necessary to an and the screw correspondingly shaped, as seen understanding of my invention. It will be in Fig. 4, but this particular construction is understood of course, that this head is mountnot essential. ed on the machine in the usual way; in some The cutters are made much longer than 0 o machines the head is revolved and in others necessary for actual use at first, and the methit is stationary. The cutter-head here shown 0d of mounting them in the holders described is of a well known type of construction,which above, provides for their adjustment as they provides for the opening and closing of the are worn out. In order to effect this, the fascutters by the movement of one ring upon tening screws are removed, the cutters taken 45 another, and is sometimes known as a ring out and the worn sections ground or out OK,

holder. Briefly stated,it consists of an outer when they are replaced and secured as exring B, and an inner ring 0. The ring B,has plained, so that the cutters may be used up an inwardly projecting flange 1) at one edge, almost their entire length. The screws also which extends over the front of the ring 0, provide for setting the cutters; the latter may 10: 50 and the two are secured together by means he set by the cutting teeth, if desired, by pullof a thin ring D, rabbeted to the flange b and ing out the same number of teeth on each one; they may also be set by the fastening screws, for if the threads of the latter are the same as the cutting teeth, it will be only necessary to change the position of the screw a certain number of threads to make a corresponding adjustment of the cutter, or if the threads of the screw are only one-half the size of the cutter threads, the movement of the screw must be double the number of threads required for the projecting cutting teeth.

In the drawings, the opening within the cutters is shown slightly contracted, this is an' ordinary arrangement for making a conical thread, but it will be understood that it is merely an arbitrary arrangement, and that the holders are set parallelto each other when required, and even sometimes slightly incline the other way when it is desired to cut a very long thread.

The means here shown for expanding and contracting the opening within the cutters, are of well known construction, and need only brief reference. The outer ring B, is provided with a series of eccentric depressions or recesses I) made in its inner surface and corresponding to the openings in the inner ring for the cutter holders. The edge of the ring is also cut away along these recesses to form an angular opening 19 as seen in Fig. 2. The cutter holders E, are provided with arms 6 on their outer ends, with a hook or angular bend at their extremities, adapted to take into the angular opening or groove 6 and these latter being also eccentric, corresponding to the recesses outside of which they run, as indicated in dotted lines in Fig. l, the movement of the outer ring upon the inner one will obviously adjust the main holders in and out, in a Well known way. The outer ring is provided with a short handle H, for giving this movement and there are stops I, for limiting it as usual. I do not wish to be understood as limiting my invention to this particular construction of head, however, forthe method of mounting and fasteningthe cutters in their threading machines; the relative position of the parts being changed as required; this will be evident to any one familiar with the construction and operation of these machines. I wish to be understood therefore, as claiming the improvement whereof it may be applicable.

Having thus described my invention, what I claim as new'and desire to secure by Letters Patent, is:

1. In screw threading and like machines the cutter holder provided with longitudinal seats for the cutters and threaded grooves running along one side of said seats and opening thereinto, in combination with long cutters mounted in said seats and provided with threaded sections 011 the side adjacent to the said threaded grooves, whereby the said two parts form a threaded aperture, and fastening screws adapted to be turned into said threaded apertures lengthwise of the cutters to secure the latter, substantially as described.

2. The cutter holderlfl provided with grooves e running lengthwise of the surface thereof and slightly tapering threaded grooves 6' running through the holder and opening into the seat grooves at one side thereof, in combination with long cuttersF provided with threaded grooves f running along one side thereof and making a tapering threaded aperture with the threaded side grooves e and tapering fastening screws G adapted to fit the said threaded apertures, substantially as described.

IVILLIAM IV. DOOLITTLE.

Witnesses:

A. M. BEST, WV. 0. (Joanna 

